Motor-controller.



A. H. BUCKELEW. MOTOR CONTROLLER.

APPLICATION FILED FEB.21 1905I 905,790.

Patented Dec. 1, 1908.

2 SHEETS-SHEET 1.

, APPLIOATIONIILED rEB.21, 19os 905,790,

A. H. BUOKELEWf v MOTOR CONTROLLER.

Patented Dec. 1,1908.

2 SHEETS-SHEET z.

ALBERT H. BECKELEW, OF NEWARK, NEW JERSEY.

MOTOR-CONTROLLER.

Specification of Letters Patent.

Patented Dec. 1, 1908.

Application filed February'21. 1905. Serial No. 246,727.

T 0 all whom it may concern: 4

Belt known that I, ALBERT H. BUcKELnw, a citizen of the-United States, residing at Newark, in the-county of Esser; and State of 1 New Jersey, have invented certain new and f useful Improvements in l\ lotor-Controllers,

of whichthe following is a full, clear, and exact specification.

This invention relates to motor controllers and more particularly has reference to that class of (levices'in which the controlleris operated by a pilot motor, the latter being controlled by manual switches.

The object of the invention is to provide a mechanism of this character by which the operator can control. the main motor at various speeds from directional switches alone, without necessitating his attention to the p osit-ions of the controller for different speeds. The invention is particularly applicable to the control of one or more motors which it is desirable to run at various speeds in both directions.

As usually constructed, dental or surgical engine motors, in particular, are controlled by a small controller which-is moved bv the foot of the operator for difierent speeds'and directions. This necessary positioning of the controller distracts the attention of the operator from the work inhand, causing delay and possible injury to the patient. 1 By this vention, I provide a pilot motor to move the main controller step b step in either direction, through push uttons or other switches, which require no more attention from the operator than the force necessary to actuate them.

The invention will be more-fully described with reference to the form thereof shownin the accompanying drawings, in which- Figure 1 is a top plan view, the cover being removed, Fig. 2 is a vertical section, Fig. 3 is a detail view at right angles to .Fig. 2, seen from the left. Figs. 4 and 5 are detail views of the intermediate devices for stopping the pilot motor automatically, Figs. 6 and 7 show the center stop. 5 Figs. 8, 9, 10, 11 and 12 represent forms of contact devices. ,Fig.

.13 is a diagram showing the electrical circuits.

Referring to Figs. 1 and 23, 1 represents a base carrying a side casing 2 and a removable cover 3. Pivotally mounted 011 the lugs 4, so as to swing vertically relatively to the base is a framework 5, carrying the pilot The pllot motor comprises an armamotor.

ture 7, field magnets S,'arn1aturc shaft- 9, brushes 10, commutator 11. The armature shaft 9 has a worm which meshes with a gear 13 carried by. a shaft 14 journaled in the frame 5. On the end of shaft- 14. is a gear 15 which meshes with a segmental gear 16 carried by a revoluble spider 17 j ournaled in the casing 1. Mounted to turn with the gear 16 isthe controller arm 18 which moves over contacts within the case 19 for,controlling the main motor, a certain position of the arm 18 at either side of the center, cprresponding to a certain speed of the main motor in one or the other direction.

The operation of the device generally, so far as described is as' follows: The pilot motor always runs at the same speed and. byreversing the fields in a manner to be hereafter described, is made to run in either direction at the will of the operator. The pilot motor having been started, it will be seen that the speed and direction of the main motor will depend upon the position of the controller arm which is governed by the movement of the gear 16 derived from the pilot motor. I have provided means whereby a single actuation of the operators switch will start the pilot motor and move the controller arm to such position as to set the main motor in op-- eration at its first speed. When this position is reached the pilot motor is automatically stopped. In case it is desired to run the main mot-or at its second or any other speed, a further ectuation ofthe operator's switch will again start the pilot motor and move the'main controller to the next position. If it is desired to reverse the main motor, means is provided by which this can be done through a 'step-by-step movement of the controller,

or a quick movement, as may be desired. 1 t is thus possible to go back to the center from any of the different speeds, step-bystcp,

through the operatorsswitch and it is also possible to cause a quick stop by bringing the controller back to center without this step by-step movement. This latter result is accomplished by swinging the pilot motor frame carrying the pinion 15, out of engagement with the gear 16, leavin the controller gear 16 free to be swung badl: to center by any suitable centering device, such as the two armed spring' 10 (see 'Fig. 2). This spring 4,0 is coiled around the shaft of the main controller arm 18, and its two arms bear on opposite sides of a movable pin 41, carried on arm .18, and'a fixed pin 42 mounti othersuitable source of current supply which .is connected by a wire 63 with the push butmagnets 42 and 43 which-are carried on thebase -1.

ed on the lower side of themain controller 19,

It will be seen thatthe'pin 41 is free to move in either direction against one or the otherarm of the spring and that when the gear is released the spring acting on the pin 41 will return the controller arm 18 to central position and als the gear 16. In order to tilt the pilot n otor frame and disengage the gear from the gear 16, for a quick stop of the main motor,- I have provided a pair of These magnets are of the" firon clad type, and to the casing of each is piv-' oted an armature 44. Connected with each armature. 44 is a small cable 45 whichipassesi over a pulley-46 carried by the pilotmotor frame. The magnets 42 and 43 are in the pilot motor circuit and are controlled bythe operators hand switch, and when both magnets are simultaneously energized the'arma tures 44 will be pulled down together, carryspring 40.

ing the pilot motor frame withthem, against spring 71, disengaging thegear 15 from the ,gear 16, thus leavingthe controller arm-18 free to be turned to the central position by tra l position, the one-or the other of the magnets 42, 43 is energized, according to the direction of the pilot motor, and as soon as one armature 44 is pulled down the other will correspondingly rise, producing no movement of the pilot motor frame. 1

49 is a brake magnet in the pilot motor cir- 'cuit which actuates a brake lever 50, pivoted at 51, controlled by a spring 52 and carrying a brake shoe 53. Whenever the magnet 49 is denergized by stopping the pilot motor the sprin 52 causes t in a well to the-pilot motor,

having clamps 55 carryingtwo push buttons by a three wire cable 58 Figs. 11 and-12 showa clamp adapted to'be attached to the shoe of the operator, comprising a spring bow 59 ,6 Oandbent upwardly as at 61 atthe toe portion.

pressure against the floor.

,The electrical connections'fare'shown in shutt'on 56, through smegma; ;8, w1 re 66,

.Fig. 13 and are as follows: 62'isa battery or Wire ,64 leads from the push tons 56 and 57.

magnet 42, wire 65, field In returning step-by-step to oen-- e brake to be applied sequence? of operations.

Figs; 8,9 and 10 showa'form Mounted in the underside are the push butt'oris 5'6 and. 57 which can be operated singly or simultaneously by step 'pushbutton 57, which gwrll cause the pilot brushes 1,0 through a'r throughfe i re magnet43,

mature 7; oi'the pilot motor and'thence by Wire 67 through brake magnet 49 and Wire 68 to the battery. By closing the circuit throughthe button 56 it will therefore be seenthat the pilot motor will be started and rotated in one direction. For the sake of convenience, it will be assumed that the push button56 will cause the gear 16 to travel clockwise, in Fig. 1, and the push button 57 to revolve the gear in the opposite direction. The pilot motorhaving been started, will continue in operation until the gear 16 has revolved latch 36 over high portion 34 of the roller, which causes a circuit t-o be closed through contacts 38 and 39 (see Fig. 4), As

soon as the current passes through the fields 8 of the motor the lever 30 will be attracted by the fieldmagnet so as tobring the roller into the'pathot' the latch 36. Contacts 38 and 39 are in a shunt circuit around the pilot motor-armature and the brake magnet 49 so that whenever the contacts 38-and 39' are closed the armature will be short-circuited upon itself forming a dynamic brake, and the brake magnet shunted, permitting the spring '52 to apply the mechanical brake, thus stopping the pilot motor at this point. Upon releasing the push but-ton 56 the motor held magnet is deenergized and spring 32 withdraws the roller trom under latch 36, thus opening contacts 38 and 39. See Fig. 5.

The main motor controller has now been moved to a position for its first speed, and is held against spring 40 in this position'by the brake, It now it is desired to run. the main motor at its next speed, thepush button 56 is again operated to move the gear 16 further and thereby the main controller, another step to secure this next speed by the same it will be observed that if by inadvertence the operator does not release the push button 5 6'afterhe has caused the main controller to be moved to the desired position, no harm results, because the pilot motor is positively stopped by the closing of pontacts 38 and 39, thuspreventing an accidental movement to a higher speed than desired. After having been once closed to stop the motor, the contacts 38, 39hold it stopped as long as they. remain closed, that is to say, until the spring 32 withdraws the roller from under latch 36; This cannot occur until the magnet controlling the lever 30 is deenergized, which, ifthe field magnet be'used or a magnet incircuit therewith, occurs ,when the operator releases the push button,\thereby releasing-the lever 30 and opening the contacts 38, 39., After the lever has moved outward, thernotor can again be started in either direction by the push button.

'Inorder tov bring the main motor step-byto center the operator will actuate the motor to operatein the opgolsditeg directiir e s. wire 49, wire 68, as. before. As'soon'jas lug 26 of the central latch 25' has struck the lower portion35-of the-"roller, the contacts 38. and 39 will The again closed (Fig.6), "thus stopping the'piletmotorj at the central position the pilot motor, the contactsSS and 39 must be gpened, and this can'only be done at the. can ter position; by tilting the pilot motor frame by pressin'g'both push buttons 56 and 57 at once, torenergize both magnets 42 and 43.

. ins

When both'push buttons are 'erated simultaneously, which can be done rom any position, the fields of the pilot motorbeingopposed to eachother, become neutral, so that as soon'as the frame drops sufficiently, the spring 32 will throw the roller outward 0 ening contacts 38 and 39 Figs.' 7 and 13. .his

' can be done from any position as the rollerin its lower outward the latches 36.

Fig. shows the position after a push buttoo has been releasedat one of the stops so that another actuation of the push button position (Fig. 7) clears all will. move themain controller to the next speed. It will also be seen that in returning to center step-bystep, asin Fig. 6, the pilot motor cannot be started with the main controller-in off position until the contacts 38' and 3.9 are opened or until the high part 34 of the rollercan pass under lug 26 of latch 25, v which is accomplished by dropping the frame with both push buttons. The spring 71 re,- turns the frame to upper position to reengage the gear 16 with pinion as soon as the push buttons are released, (or one of them) and the roller then lies .to the left of the lug 26in Fig. 7. As soon as the gear has moved sufficiently, the field magnet draws the lever position to strike the first of the latches 36 to stop the pilot motor. This provision that the motor must always stop at the central position is of considerable importance in dental work because of its delicacy and the necessity of an absolutely reliable control which requires a minimum of attention from the operator and absolute freedom from acci- -dental reversal. By this mechanism just described, all the operator has to .do, is to dis tinguish between his twopush buttonsand actuate them one or more times to secure any desired forward or backward speed, thus dispens'ing with the usual foot controlled devices now in use. It will be understood that proper binding posts and wiring arrangements are used to connect up the-various circuits. The

. push buttons may be disposed at any suitableplace and the wires may be led to the mechanism through an eyelet in the case.

It is obvious. that two or more controllers can be operated simultaneously in multi le by the same mechanism for controlling a p urality of motors simultaneously.

I do not restrict myself 'to the precise consecure" by Letters Patent, is, 'f It be seen that iii order to again start structionherein shown as many mo'difications and changes may be made without departing from the scope of the invention.

Having thus described my invention, I 'de cla're that what I claim as new and desire to troller having a plurality of speed positions,

of push button controlled means comprising a rotating pilot motor for moving'said controller to the different positions, and a solenoid controlled by said push button means for disengaging said controller from the pilot motor, whereby said controller may be returned from any running position to off position either ste by step or at one actuation of they controlling switch, substantiallyas described.

3. The combination with a motor controller, of a pilot motor for actuating said controller step-by-step to its running positions without stopping the main motor in going from one position to the next, and

means whereby the pilot motor can be disconnected and thrown out of operation and r the controller returned to its off substantially as described.

4. The combination with a motor controller, of a pilot motor for actuating said position,

controller step-by-step, and a pair of directional switches for controlling the pilot motor'without stopping the main motor in going from one o'sition to another, substantially as descrihed.

5. The combination with a inotor controller, of a rotary pilot motor for actuating said controller to its running positions without stopping themain motor or controller from going from one position to another, and means whereby the pilot motor can be mechanically disconnected and the controller rotated backward to its'off position independently of the motor, substantially as described.

6. The combination with a motor controller, of a pilot motor for actuating said controller to its running positions, said pilot motor having a rotary shaft ada ted to engage a rack carried by the controler, means for disengaging the shaft of the pilot motor from the rack and thereby returning the controller to off position, and means for stopping the controller at its off position, substantially'as described.

- 7. The combination witha controller, havand the controller and return the controller to off position, substantially as described.

8. The combination with a controller, of a motor for operating the same, independent circuits for operating said motor in either direction, and means whereby the controller is returned to its initial position by closing both circuits, substantially as described.

9. The-combination with a controller, a motor for operating the same, independent circuits for operating said motor in either direction, and means for closing-both of said circuits and thereby breaking the driving connection between the motor and the con' troller, substantially as described.

10. The cornbination with a controller having. a plurality of positions, of a motor for operating the same, independent circuits for operating said motor in either direction, and means whereby the reversal of the motor by a single closing of its circuit moves the controller reversely one position su ri stantially as described.

11. Thec'ombination with a motor having circuits for, operating it in opposite dir'ections, of a circuit closer for stopping the mo tor after a redetermined movement, and means where y the motor is locked against movement until the circuit closer is opened, substantially as described.

12. The combination with a motor having circuits for operating it in oppositedirections, of a circuitcloser for stopping the motor after a predetermined movement, means whereby the motor is locked against movement until the circuit closer is- 0' ened, and means in the motor circuit for re easing the motor, substantially as described;

, 13. The combination with a motor and a cont-rolling circuit, of means for automatically stopping and locking the motor after a predetermined movement, and means whereby the motor is released when the controlling circuit is opened; substantially as described.

14. The combination with a motor and controlling circuits, of means for giving the motor a predetermined movement in either direction from its initial position, means for returning the motor to its initial position and automatically locking it, and means for releasing the motor, substantially as described.

In testimony whereof I afllx my signature, in presence of two witnesses.

' ALBERT H. BUCKELEW Witnesses:

JULIAN S. WoosTnR. GEO. A. I'IOFFMAN. 

